I was looking at purchasing an 830 HP carb used in good condition for $350 for use on a 400 small block, does that seem like a good deal and does anyone have experience with the HP series?

Griff, They're good carbs but I usually steer away from used carbs at any price if I don't know their history. Ask why is it for sale and find out it history if You can.

Bill, I started to question him and he backed out of the deal :D, he changed the power valves and jets my guess is that he screwed something up.